Concerns over pollution from intensive animal production has lead to developments in enzyme technology to improve the utilisation of minerals such as phosphorous (P) from the diet, and to reduce levels of added inorganic minerals. BASF Natuphos® (registered trademark of Gist-brocades) is a formulation of microbial phytase which improves digestibility of P from plant origin. The aim of this study was to determine whether reducing levels of inorganic P (Dicalcium Phosphate-18%P) and including quantities of Natuphos® would effect have any effect on growth performance and bone strength.